A power tool based on an integrated guard assembly

Abstract

The application discloses an electric tool based on an integrated protection assembly and belongs to the technical field of electric tools. The electric tool is provided with a fixed shell and an output shaft and comprises a rotating disc fixed on the output shaft, a pawl hinged on the rotating disc and with a gravity center deviated from a hinge axis, an adjusting piece arranged on the rotating disc, a return spring with two ends connected with the pawl and the adjusting piece, the adjusting piece being movable to change spring pre-tightening force, and a ratchet fixed on the fixed shell and located on a pawl swing path. When normally disassembled, spring elastic force is greater than pawl centrifugal force, the pawl is separated from the ratchet; when the nut is out of the output shaft, the rotating speed of the output shaft is increased, the pawl centrifugal force is greater than the spring elastic force, the pawl is thrown out in a direction away from the center of the rotating disc and is engaged with the ratchet, and the output shaft is stopped from rotating. The application is triggered by a pure mechanical centrifugal mode, is automatically locked after the nut is out to prevent flying out, and can set different trigger sensitivities through the adjusting piece, and has the advantages of compact structure and high reliability.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and more specifically, to a power tool based on an integrated protective component. Background Technology

[0002] Electric wrenches are widely used for bolt removal in steel structure installation, bridge construction, power construction, and other fields. During the reverse unscrewing process of a nut, if the operator fails to release the trigger in time after the nut has completely unscrewed the bolt, the output shaft will continue to spin at high speed with the nut, making it very easy for the nut to fly out of the sleeve, causing injury or loss. Especially when working at heights or in confined spaces, a flying nut can lead to serious safety accidents.

[0003] To address this issue, some electric wrenches are equipped with a reverse automatic stop function. A common implementation involves detecting sudden changes in output shaft torque or motor current; when the nut disengages and causes a sudden drop in load, the control module cuts off the power. However, in actual use, it has been found that thread corrosion, foreign object jamming, or uneven bolt-nut fit can all cause brief fluctuations in torque or current, leading to system misjudgment and premature shutdown, affecting normal operating efficiency. Furthermore, once the nut disengages, the torque is extremely low, and relying solely on torque drop is insufficient to confirm whether the nut has completely disengaged and is in a free-spinning state; a delayed shutdown could still cause the nut to fly out. In addition, existing solutions largely rely on electronic sensors and control circuits, which reduce reliability under harsh working conditions and are costly. Another approach is to add a mechanical anti-disengagement structure to the socket, but such structures usually require manual unlocking by the operator, which is cumbersome, and the anti-disengagement force is not adjustable, making it unsuitable for electric wrenches with different nut sizes and speeds. Summary of the Invention

[0004] The problem solved by this invention is that when an electric wrench is reversed to remove a nut, the nut may fly out due to inertia after it comes off and spins freely, causing a safety hazard.

[0005] To address the aforementioned problems, this invention provides an electric tool based on an integrated protective component. The electric tool includes a fixed housing and an output shaft. It comprises a rotary disc, a pawl, an adjusting member, a return spring, and a ratchet. The rotary disc is fixed to the output shaft. The pawl is hinged to the rotary disc, with its center of gravity offset from the hinge axis. The adjusting member is mounted on the rotary disc and can rotate relative to it. One end of the return spring is connected to the pawl, and the other end is connected to the adjusting member. The adjusting member can change the preload of the return spring by rotation. The ratchet is fixed to the fixed housing and located on the swing path of the pawl. When the output shaft is at its normal disassembly speed, the spring force of the return spring is greater than the centrifugal force generated by the rotation of the pawl, keeping the pawl and ratchet separated. When the output shaft speed increases due to the nut coming off the bolt, causing the centrifugal force of the pawl to exceed the spring force of the return spring, the pawl is thrown away from the center of the rotary disc and engages with the ratchet, stopping the output shaft from rotating.

[0006] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: This application forms a purely mechanical centrifugal trigger locking mechanism by setting a rotating disk, an eccentric pawl, a return spring, and a fixed ratchet. The moment the nut comes off the bolt, the output shaft's speed increases sharply due to the loss of load. The centrifugal force generated by the pawl quickly overcomes the spring force, causing the pawl to swing away from the center of the rotating disk and engage with the ratchet on the housing, thus locking the nut within a very short free-spinning angle, effectively preventing the nut from flying out and causing injury. Compared with existing electronic reverse self-stop solutions that rely on torque or current detection, this application requires no sensors or control circuits, avoiding accidental shutdowns caused by disturbances such as thread jamming, and the trigger response is more direct and reliable. Compared with mechanical anti-loosening sleeves that require manual unlocking, this application automatically triggers locking after the nut comes off, requiring no additional operator action, making it more convenient to use. Meanwhile, by setting a rotatable adjustment component to change the preload of the reset spring, the operator can flexibly set the trigger sensitivity according to different specifications of nuts or different speeds of electric wrenches, taking into account both safety and adaptability to working conditions.

[0007] In one technical solution of the present invention, the adjusting component is an adjusting nut; the rotating disk is provided with an inner ring, the surface of which is provided with an external thread, and the adjusting nut is connected to the external thread; rotating the adjusting nut allows it to move along the axis of the rotating disk while rotating, thereby adjusting the preload of the return spring.

[0008] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: By adjusting the nut and having an external thread on the rotating disk to engage with it, the operator only needs to rotate the adjusting nut to move it axially along the rotating disk, thereby continuously and precisely changing the tension of the return spring, i.e., the spring's preload, and conveniently setting the required trigger lock-up speed threshold. The adjusting nut and rotating disk have a simple and reliable fit, a continuous adjustment range, and intuitive operation. Sensitivity adjustment can be completed without the need for additional tools, adapting to the working conditions of different nut sizes or electric wrenches with different speeds, thus increasing the application scenarios of the equipment.

[0009] In one technical solution of the present invention, the adjusting component includes a fixing post, which is sleeved on the surface of the adjusting nut, and multiple return springs are fixed on the side away from the pawl; the fixing post moves axially with the adjusting nut on the inner ring of the rotating disk to change the tension of the return springs.

[0010] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: By installing a fixing post on the adjusting nut and fixing the ends of multiple return springs to the fixing post, when the adjusting nut moves axially, the fixing post drives all springs to stretch synchronously and equally, ensuring the consistency of the preload of each spring and avoiding pawl wobbling or jamming due to uneven spring force. At the same time, the fixing post, as an independent connecting component, simplifies the assembly process between the springs and the adjusting nut, improving transmission reliability and adjustment accuracy.

[0011] In one technical solution of the present invention, when the adjusting nut moves away from the rotating disk, the tension of the return spring increases, the preload of the return spring increases, and the centrifugal force threshold required for the pawl to trigger locking increases; when the adjusting nut moves closer to the rotating disk, the preload of the return spring decreases, and the centrifugal force threshold required for the pawl to trigger locking decreases.

[0012] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: By clearly defining the correspondence between the direction of movement of the adjusting nut and the spring preload and centrifugal force threshold, the operator can intuitively and predictably adjust the speed threshold required for triggering locking. Moving the adjusting nut away from the rotary disc increases the centrifugal force threshold and the speed required for triggering locking, suitable for large-size nuts or high-speed applications; moving the adjusting nut closer to the rotary disc decreases the centrifugal force threshold and the speed required for triggering locking, suitable for small-size nuts or low-speed applications. This clear adjustment logic and well-defined operation direction allow the same electric wrench to flexibly adapt to different working conditions, avoiding false triggering or trigger delays caused by fixed trigger thresholds, and significantly improving the tool's adaptability and safety.

[0013] In one technical solution of the present invention, the adjusting nut is set to the centrifugal force threshold required for the pawl to trigger locking, according to the specifications of the nut to be disassembled or the rated speed of the electric wrench.

[0014] Compared to existing technologies, the technical benefits of this solution are as follows: By allowing the adjusting nut to set the centrifugal force threshold required for pawl triggering and locking based on the size of the nut to be disassembled or the rated speed of the electric wrench, the triggering sensitivity is matched to the working conditions. When the operator is using a large-size nut or a low-speed wrench, the adjusting nut can be set to a higher preload setting to avoid accidental triggering due to fluctuations in normal operating speed; when using a small-size nut or a high-speed wrench, it can be set to a lower preload setting to ensure timely locking after the nut comes off. This allows the same electric wrench to cover multiple usage scenarios, effectively balancing the needs for preventing accidental triggering and timely braking, significantly improving the tool's practicality and safety.

[0015] In one technical solution of the present invention, the adjusting component further includes a locking component, which is disposed on the adjusting nut and is used to lock the relative position of the adjusting nut and the rotating disk.

[0016] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: by setting a locking element on the adjusting nut, the relative position of the adjusting nut and the rotating disk can be reliably fixed, preventing the adjusting nut from undergoing unexpected axial displacement due to inertia or vibration under high-frequency vibration or high-speed rotation conditions of the electric wrench, thereby ensuring the long-term stability of the preload of the return spring.

[0017] In one technical solution of the present invention, the power tool further includes: a pin, which is disposed on a rotating disk, and one end of the pawl is fixed to the rotating disk by the pin.

[0018] Compared with existing technologies, the technical advantages achieved by adopting this solution are as follows: By hinged to the rotating disk at one end of the pawl using a pin, the pawl can swing freely around the pin, while ensuring the connection strength and positional accuracy between the pawl and the rotating disk. This pin connection structure is simple, easy to process and assemble, and the pin can be replaced individually after wear from long-term use, reducing maintenance costs. Compared with one-piece molding or complex hinged structures, the pin connection not only meets the pawl's swinging requirements under centrifugal force but also avoids jamming caused by manufacturing errors, improving the mechanism's motion reliability and service life.

[0019] In one technical solution of the present invention, the pawl is provided with a connecting part, which is located on the side of the pawl away from the pin. The connecting part is fixedly connected to one end of the return spring. The return spring applies a pulling force to the pawl through the connecting part, so that the pawl remains separated from the ratchet at the normal disassembly speed.

[0020] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: By setting a dedicated connecting part on the side of the pawl away from the pin shaft and fixing one end of the return spring to this connecting part, the spring tension can directly act on the end of the pawl. This effectively limits the swing angle of the pawl when the output shaft is at normal disassembly speed, ensuring that the pawl and ratchet remain in a stable separation state, and avoiding abnormal noise or wear caused by the pawl accidentally contacting the ratchet due to vibration or slight centrifugal force. At the same time, the connecting part separates the spring's point of action from the locking part of the pawl, optimizing the force distribution on the pawl, making the spring tension direction closer to the tangential direction, improving the positional accuracy and reliability of the pawl's reset at low speeds, and reducing the risk of jamming.

[0021] In one technical solution of the present invention, the pawl is provided with a locking part, which is located on the side of the pawl near the connecting part and facing the ratchet tooth. When the centrifugal force of the pawl is greater than the elastic force of the return spring, the locking part engages with the ratchet tooth, so that the output shaft stops rotating.

[0022] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: By setting a locking part facing the ratchet on the side of the pawl near the connecting part, when the nut comes off, causing a sudden increase in the output shaft speed and the centrifugal force of the pawl exceeding the spring force, the locking part can immediately form a stable engagement with the ratchet on the fixed housing, thereby locking the output shaft within a very short idle stroke and preventing the nut from flying off. The compact layout of the locking part and the connecting part shortens the swing response path under the action of centrifugal force, improving the timeliness and reliability of locking.

[0023] In one technical solution of the present invention, the power tool further includes: a drive assembly and a controller, wherein the drive assembly is kinetically connected to the adjusting nut, and the controller is electrically connected to the drive assembly; the controller is used to send adjustment commands to the drive assembly to drive the adjusting nut to move along the axial direction of the rotating disk, thereby realizing the electronically controlled adjustment of the preload of the reset spring.

[0024] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: By setting up a drive component and controller, the axial movement of the adjusting nut is upgraded from manual rotation to electric drive. The operator can remotely send commands through the controller to precisely control the displacement of the adjusting nut, thereby realizing the digital and automated adjustment of the preload of the return spring. This solution eliminates the need for manual rotation of the adjusting nut, making it particularly suitable for scenarios where electric wrenches are installed in confined spaces or where direct operation is difficult when working at heights, thus reducing the risk of human error.

[0025] In summary, the above-mentioned technical solutions of this application can have one or more of the following advantages or beneficial effects: i) No control circuit or external power supply is required. Utilizing the physical phenomenon of a sudden increase in output shaft speed upon nut release, centrifugal force automatically triggers the pawl and ratchet locking mechanism, fundamentally avoiding the problems of interference, misjudgment, or delays in the control circuit. ii) By rotating the adjusting nut to change the tension of the return spring, the centrifugal force threshold required for triggering locking can be continuously or progressively set, thus adapting to different nut specifications and electric wrenches with different rated speeds, balancing prevention of accidental triggering and timely braking. iii) The adjusting nut engages with the external thread on the rotating disc, allowing the operator to directly control the rotation of the nut to change the preload. The adjustment direction and effect are clear, requiring no specialized tools. Attached Figure Description

[0026] Figure 1 This is a structural diagram of a power tool based on an integrated protective component according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the ratchet tooth inside the power tool in an embodiment of the present invention; Figure 3 This is a schematic diagram of the integrated protection component in an embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the engagement of the pawl and the ratchet teeth in an embodiment of the present invention; Figure 5 This is a schematic diagram of the adjustment of the adjusting nut in an embodiment of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the adjustment of the adjusting nut in an embodiment of the present invention. Figure 2 .

[0027] Explanation of reference numerals in the attached figures: 1-Power tool; 11-Fixed housing; 12-Output shaft; 13-Rotating disc; 14-Pawl; 141-Connecting part; 142-Locking part; 15-Adjusting part; 151-Fixing post; 16-Return spring; 17-Ratchet; 18-Pin. Detailed Implementation

[0028] The purpose of this invention is to provide an electric tool based on an integrated protective component. This electric tool can automatically lock after the nut comes off to prevent the nut from flying out and injuring people. Different trigger sensitivities can be set through an adjustment component. It has the characteristics of compact structure and high reliability.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] See Figures 1-6This invention provides an electric tool 1 based on an integrated protective component. The electric tool 1 has a fixed housing 11 and an output shaft 12. The electric tool 1 includes: a rotary disk 13, a pawl 14, an adjusting member 15, a return spring 16, and a ratchet 17. The rotary disk 13 is fixed to the output shaft 12. The pawl 14 is hinged to the rotary disk 13, and the center of gravity of the pawl 14 is offset from the hinge axis of the pawl 14. The adjusting member 15 is disposed on the rotary disk 13 and can rotate relative to the rotary disk 13. One end of the return spring 16 is connected to the pawl 14, and the other end is connected to the adjusting member 15. The adjusting component 15 can change the preload of the return spring 16 by rotation; the ratchet 17 is fixedly mounted on the fixed housing 11 and located on the swing path of the pawl 14; when the output shaft 12 is at the normal disassembly speed, the elastic force of the return spring 16 is greater than the centrifugal force generated by the rotation of the pawl 14, and the pawl 14 and the ratchet 17 remain separated; when the output shaft 12 speed increases due to the nut coming off the bolt, causing the centrifugal force of the pawl 14 to be greater than the elastic force of the return spring 16, the pawl 14 is thrown out in a direction away from the center of the rotating disk 13 and engages with the ratchet 17, causing the output shaft 12 to stop rotating.

[0031] Furthermore, this power tool 1 achieves automatic protection and locking through a purely mechanical centrifugal trigger structure, without relying on electronic sensors, control modules, or other easily interfered components. The overall structure is compact and operates stably and reliably. It can quickly respond and forcibly lock the output shaft 12 the moment the nut comes off, eliminating the risk of it flying off during idling from the root. At the same time, it allows the operator to freely adjust the speed threshold of the protection trigger according to the actual work requirements, balancing the smoothness of normal operation with the timeliness of protection against abnormal idling.

[0032] Specifically, see Figure 1As shown, the power tool 1 has an integrated protective component. The protective component is assembled on the shaft section between the impact mechanism and the reduction mechanism of the output shaft 12 and is rigidly and synchronously connected to the output shaft 12. The protective assembly mainly includes a rotating disk 13, a pawl 14, an adjusting member 15, and a return spring 16. The rotating disk 13 is fixedly sleeved on the outer periphery of the output shaft 12 and rotates synchronously with the output shaft 12. The pawl 14 is mounted on the end face of the rotating disk 13 by a hinge. The center of gravity of the pawl 14 is offset from the hinge axis, so that when the rotating disk 13 drives the pawl 14 to rotate at high speed, the pawl 14 can swing outward around the hinge axis under the action of centrifugal force. One end of the return spring 16 is connected to the pawl 14, and the other end is connected to the adjusting member 15. Under normal conditions, the tension of the return spring 16 limits the pawl 14 to the initial position. The rotating disk 13 is covered by a fixed housing 11. A ratchet 17 is fixedly provided on the inner wall of the fixed housing 11. The ratchet 17 is located within the swing path of the pawl 14 and does not rotate with the output shaft 12. During normal disassembly, the output shaft 12 is in the normal speed range. The tension of the return spring 16 is greater than the centrifugal force on the pawl 14, and the pawl 14 remains separated from the ratchet 17. The output shaft 12 can rotate normally to drive the impact mechanism to complete the disassembly. When the nut is completely dislodged, causing the load on the output shaft 12 to disappear and the speed to increase sharply, the centrifugal force on the pawl 14 is greater than the tension of the return spring 16. The pawl 14 swings outward around the hinge axis and quickly engages with the ratchet 17 on the inner wall of the fixed housing 11. Through rigid engagement, the output shaft 12 is forcibly locked to prevent it from rotating at high speed and causing safety hazards.

[0033] Preferably, the adjusting element 15 is an adjusting nut; the rotating disk 13 is provided with an inner ring, the surface of which is provided with an external thread, and the adjusting nut is connected to the external thread; rotating the adjusting nut allows it to move along the axis of the rotating disk 13 while rotating, thereby adjusting the preload of the return spring 16.

[0034] Specifically, see Figure 3 As shown, the adjusting component 15 adopts a threaded adjustment structure. The rotating disk 13 has an integrally formed inner ring structure on the side facing the output shaft 12. The outer circumferential surface of the inner ring is machined with continuous external threads. The adjusting nut engages with the external threads of the inner ring of the rotating disk 13 through the internal threads. By rotating the adjusting nut, the operator can drive the adjusting nut to move linearly along the axis of the rotating disk 13. The axial displacement of the adjusting nut directly changes the tension length of the return spring 16, thereby continuously and precisely adjusting the preload of the return spring 16, and ultimately changing the centrifugal force threshold required for the pawl 14 to trigger the protective locking, achieving flexible adjustment of the protective trigger sensitivity. The overall threaded adjustment structure is simple and reliable, with stable and controllable adjustment stroke. It can be operated without the need for special tools, adapting to the needs of rapid on-site adjustment.

[0035] Preferably, the adjusting member 15 includes a fixing post 151, which is sleeved on the surface of the adjusting nut, and a plurality of return springs 16 are fixed on the side away from the pawl 14. The fixing post 151 moves axially on the inner ring of the rotating disk 13 with the adjusting nut to change the tension of the return springs 16.

[0036] Specifically, a fixing post 151 is fixedly installed on the outer periphery of the adjusting component 15, and the ends of all return springs 16 away from the pawl 14 are centrally and fixedly connected to the outer periphery of the fixing post 151. When the adjusting component 15 moves axially along the rotating disk 13, the fixing post 151 moves synchronously with the adjusting component 15, causing all return springs 16 to perform equal and synchronous stretching or retraction actions. This ensures that the tension of the return spring 16 on each pawl 14 is completely consistent, avoiding pawl 14 swaying, jamming, or asynchronous triggering due to uneven stretching of the return spring 16. This significantly improves the stability and consistency of the protective component's operation, ensuring synchronous and reliable protective locking actions.

[0037] Preferably, when the adjusting nut moves away from the rotating disk 13, the tension of the return spring 16 increases, the preload of the return spring 16 increases, and the centrifugal force threshold required for the pawl 14 to trigger locking increases; when the adjusting nut moves closer to the rotating disk 13, the preload of the return spring 16 decreases, and the centrifugal force threshold required for the pawl 14 to trigger locking decreases.

[0038] The centrifugal force threshold mentioned in this invention refers to the minimum centrifugal force required for the pawl 14 to overcome the elastic force of the return spring 16, be thrown outward, and engage with the ratchet 17.

[0039] Specifically, see Figure 5 and Figure 6 This embodiment further defines the correspondence between the adjustment direction and the preload. Figure 5 The position of the adjusting nut near the rotating disk 13 is shown. Figure 6 The position of the adjusting nut away from the rotating disk 13 is shown. The direction of movement of the adjusting nut corresponds clearly to the adjustment logic of the preload of the return spring 16. When the operator moves the adjusting nut axially away from the rotating disk 13, the tension of the return spring 16 increases, and the preload increases accordingly. The pawl 14 needs a greater centrifugal force to overcome the tension of the return spring 16 and swing outward, that is, the trigger speed of the protective lock increases. Conversely, when the operator moves the adjusting nut axially closer to the rotating disk 13, the tension of the return spring 16 decreases, and the preload decreases accordingly. The pawl 14 can swing outward under a smaller centrifugal force, that is, the trigger speed of the protective lock decreases.

[0040] Preferably, the adjusting nut is set to the centrifugal force threshold required for the pawl 14 to trigger locking, based on the specifications of the nut to be removed or the rated speed of the electric wrench.

[0041] Specifically, the operator can adjust the position of the adjusting component 15 according to the specifications of the nut to be removed and the rated speed of the power tool 1, thereby setting a suitable centrifugal force threshold. For large-sized, heavy-weight nuts to be removed, or power tools 1 with high rated speeds, the adjusting component 15 is adjusted to a position with a larger preload of the return spring 16 to avoid false triggering caused by fluctuations in normal operating speed. For small-sized, light-weight nuts to be removed, or power tools 1 with low rated speeds, the adjusting component 15 is adjusted to a position with a smaller preload of the return spring 16 to ensure that the protective locking is triggered immediately after the nut comes off. Through the above matching adjustments, the same power tool 1 can flexibly adapt to various operating scenarios, effectively balancing the dual requirements of preventing false triggering and timely locking.

[0042] For example, recommended graduations for M6, M20, and other nuts can be marked on the electric wrench housing. The operator simply adjusts the nut to the corresponding graduation. When using an electric wrench with a rated no-load speed of 2000 rpm to remove a large M20 nut, due to the nut's weight and the relatively gradual increase in speed after removal, the operator should rotate the adjusting nut away from the rotary disc to the maximum preload setting, ensuring the return spring 16 is at its maximum tension. At this point, the pawl 14 requires a higher centrifugal force to trigger the lock, thus preventing accidental triggering due to speed fluctuations during normal operation, such as brief periods of free rotation. Conversely, when removing a small M6 nut, the nut is lighter and the speed increases sharply after removal. The operator should rotate the adjusting nut closer to the rotary disc to the minimum preload setting, ensuring the return spring 16 is at its minimum tension, guaranteeing that the pawl 14 will engage and lock within a very short free rotation angle after the nut is removed, preventing the nut from flying out.

[0043] Furthermore, if the rated speed of the electric wrench is low, such as 500 rpm, the trigger threshold needs to be lowered accordingly, and the adjusting nut can be adjusted to a lower preload setting; if the rated speed is high, such as 2500 rpm, the trigger threshold needs to be increased, and the adjusting nut can be adjusted to a higher preload setting.

[0044] Furthermore, the operator can quickly complete the setting according to the preload scale markings on the electric wrench housing, without having to repeatedly try and fail.

[0045] Preferably, the adjusting member 15 further includes a locking member, which is disposed on the adjusting nut and is used to lock the relative position of the adjusting nut and the rotating disk 13.

[0046] Specifically, the adjusting component 15 also integrates a locking component, which can be a locking washer, a set screw, or a spring retainer. After the adjusting component 15 completes the adjustment of the preload of the return spring 16, the locking component rigidly locks and fixes the relative position of the adjusting component 15 and the rotating disk 13, preventing the adjusting component 15 from loosening or shifting due to high-frequency vibration and high-speed rotation of the power tool 1. This ensures the long-term stability of the preload of the return spring 16, prevents the trigger threshold of the protective lock from shifting, and guarantees a stable and reliable protective effect.

[0047] Preferably, the power tool 1 further includes a pin 18, which is disposed on the rotary disk 13, and one end of the pawl 14 is fixed to the rotary disk 13 by the pin 18.

[0048] Specifically, a pin 18 is fixedly mounted on the end face of the rotating disk 13, and the pawl 14 is hinged to the end face of the rotating disk 13 via the pin 18, allowing it to swing freely around the pin 18. The pin 18 is made of wear-resistant metal, effectively improving the connection strength and rotational smoothness of the hinge structure. After long-term use and wear, the pin 18 can be replaced separately, reducing overall maintenance costs. At the same time, it prevents jamming at the hinge from affecting the centrifugal swing of the pawl 14, ensuring timely and reliable protection response.

[0049] Preferably, the pawl 14 is provided with a connecting part 141, which is located on the side of the pawl 14 away from the pin 18. The connecting part 141 is fixedly connected to one end of the return spring 16. The return spring 16 applies a pulling force to the pawl 14 through the connecting part 141, so that the pawl 14 remains separated from the ratchet 17 at normal disassembly speed.

[0050] Specifically, the end of the pawl 14 furthest from the pin 18 has an integrally formed connecting portion 141, and the end of the return spring 16 near the pawl 14 is fixedly connected to the connecting portion 141. At normal disassembly speed, the return spring 16 applies a stable tension to the pawl 14 through the connecting portion 141, effectively limiting the swing angle of the pawl 14, keeping the pawl 14 and the ratchet 17 stably separated, and preventing the pawl 14 from accidentally contacting the ratchet 17 due to vibration or slight centrifugal force, thus preventing abnormal noise, abnormal wear, or accidental locking; at the same time, the connecting portion 141 optimizes the force distribution of the pawl 14, making the tension direction of the return spring 16 more tangential, further improving the reset accuracy and operational stability of the pawl 14.

[0051] Preferably, the pawl 14 is provided with a locking part 142, which is located on the side of the pawl 14 near the connecting part 141 and facing the ratchet 17. When the centrifugal force of the pawl 14 is greater than the elastic force of the return spring 16, the locking part 142 engages with the ratchet 17, so that the output shaft 12 stops rotating.

[0052] Specifically, see Figure 2 and Figure 4 As shown, a locking part 142 is integrally formed on the pawl 14 near the connecting part 141, with the teeth of the locking part 142 facing the ratchet 17 on the inner wall of the fixed housing 11. When the nut is completely disengaged, causing the output shaft 12 to rotate rapidly, the centrifugal force on the pawl 14 is greater than the tension of the return spring 16. The locking part 142 swings outward rapidly with the pawl 14 and engages stably with the ratchet 17. Through rigid engagement, the output shaft 12 is forcibly locked. The locking response is fast and the locking strength is high. The output shaft 12 can be stopped from rotating within a very short idle stroke, completely eliminating the safety risk of the nut or parts flying out.

[0053] Preferably, the power tool 1 further includes a drive assembly and a controller. The drive assembly is connected to the adjusting nut via a transmission, and the controller is connected to the drive assembly via an electrical connection. The controller is used to send adjustment commands to the drive assembly to drive the adjusting nut to move along the axis of the rotary disk 13, thereby realizing the electronic adjustment of the preload of the reset spring 16.

[0054] Specifically, the power tool 1 can also be implemented using remote electronic control. The power tool 1 integrates a drive component and a controller. The drive component uses a miniature drive motor, which is connected to the adjustment component 15 via a transmission structure. The controller is electrically connected to the drive component and is powered by the power tool 1's battery pack. The operator can remotely send forward and reverse rotation adjustment commands via the controller. After receiving the commands, the controller controls the drive component to operate, and the adjustment component 15 automatically moves along the axis of the rotating disk 13, achieving remote, digital electronic control adjustment of the preload of the reset spring 16. This eliminates the need for manual contact with the adjustment component 15, making it particularly suitable for scenarios where the power wrench is mounted on a robot arm or aerial work platform, where manual operation is difficult. This effectively reduces the risk of human error and improves the intelligence level and operational safety of the power tool 1.

[0055] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A power tool based on an integrated protective component, characterized in that, The power tool has a fixed housing (11) and an output shaft (12), including: A rotating disk (13) is fixed to the output shaft (12); A pawl (14) is hinged to the rotating disk (13), and the center of gravity of the pawl (14) is offset from the hinge axis of the pawl (14); An adjusting member (15) is disposed on the rotating disk (13), and the adjusting member (15) is rotatable relative to the rotating disk (13); A return spring (16) is provided, with one end connected to the pawl (14) and the other end connected to the adjusting member (15). The adjusting member (15) can change the preload of the return spring (16) by rotation. The ratchet (17) is fixedly mounted on the fixed housing (11) and located on the swing path of the pawl (14); When the output shaft (12) is at normal disassembly speed, the elastic force of the return spring (16) is greater than the centrifugal force generated by the rotation of the pawl (14), and the pawl (14) and the ratchet (17) remain separated; when the output shaft (12) speed increases due to the nut coming off the bolt, causing the centrifugal force of the pawl (14) to be greater than the elastic force of the return spring (16), the pawl (14) is thrown out in a direction away from the center of the rotating disk (13) and engages with the ratchet (17), causing the output shaft (12) to stop rotating.

2. The power tool based on an integrated protective component according to claim 1, characterized in that, The adjusting component (15) is an adjusting nut; The rotating disk (13) is provided with an inner ring, and the surface of the inner ring is provided with an external thread. The adjusting nut is connected to the external thread. Rotating the adjusting nut can make the adjusting nut move along the axis of the rotating disk (13) while rotating, thereby adjusting the preload of the return spring (16).

3. The power tool based on an integrated protective component according to claim 2, characterized in that, The adjusting member (15) includes a fixing post (151), which is sleeved on the surface of the adjusting nut, and the side of the plurality of return springs (16) away from the pawl (14) is fixed on the fixing post (151); The fixed post (151) moves axially on the inner ring of the rotating disk (13) along with the adjusting nut to change the tension of the return spring (16).

4. The power tool based on the integrated protective component according to claim 2, characterized in that, When the adjusting nut moves away from the rotating disk (13), the tension of the return spring (16) increases, the preload of the return spring (16) increases, and the centrifugal force threshold required for the pawl (14) to trigger locking increases. When the adjusting nut moves toward the rotating disk (13), the preload of the return spring (16) decreases, and the centrifugal force threshold required for the pawl (14) to trigger locking decreases.

5. The power tool based on an integrated protective component according to claim 2, characterized in that, The adjusting nut sets the centrifugal force threshold required for the pawl (14) to trigger locking, based on the specifications of the nut to be removed or the rated speed of the electric wrench.

6. The power tool based on an integrated protective component according to claim 2, characterized in that, The adjusting element (15) further includes: A locking element is provided on the adjusting nut and is used to lock the relative position of the adjusting nut and the rotating disk (13).

7. The power tool based on an integrated protective component according to claim 1, characterized in that, The power tool also includes: A pin (18) is provided on the rotating disk (13), and one end of the pawl (14) is fixed on the rotating disk (13) by the pin (18).

8. The power tool based on an integrated protective component according to claim 7, characterized in that, The pawl (14) is provided with a connecting part (141), which is located on the side of the pawl (14) away from the pin (18). The connecting part (141) is fixedly connected to one end of the return spring (16). The return spring (16) applies a pulling force to the pawl (14) through the connecting part (141) so that the pawl (14) remains separated from the ratchet (17) at normal disassembly speed.

9. The power tool based on an integrated protective component according to claim 8, characterized in that, The pawl (14) is provided with a locking part (142). The locking part (142) is located on the side of the pawl (14) near the connecting part (141) and facing the ratchet (17). When the centrifugal force of the pawl (14) is greater than the elastic force of the return spring (16), the locking part (142) engages with the ratchet (17), so that the output shaft (12) stops rotating.

10. The power tool based on the integrated protective component according to claim 2, characterized in that, The power tool also includes: A drive assembly and a controller, wherein the drive assembly is kinetically connected to the adjusting nut, and the controller is electrically connected to the drive assembly; The controller is used to send adjustment commands to the drive assembly to drive the adjustment nut to move along the axis of the rotating disk (13) to realize the electronic adjustment of the preload of the reset spring (16).

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